RE: [nebula-dev] Pressing Arrow Down Key right after focusing and selection of some cell in Grid programmatically leads to NullPointerException.

[Vadym Yepishov]

Hi Christopher,

 

Thanks a lot! This bug is not present in a nightly build now indeed. Sorry
for disturbing you.

 

Best regards,

 

Vadym

 

 

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Christopher J Gross
Sent: Wednesday, January 02, 2008 6:44 PM
To: Nebula Dev
Subject: Re: [nebula-dev] Pressing Arrow Down Key right after focusing and
selection of some cell in Grid programmatically leads to
NullPointerException.

 


Hi Vadym, 

I just tried your snippet and I can't reproduce the problem.  Your
description does sounds familar though.  Perhaps its a bug that was recently
fixed.  Could you try downloading a recent nightly build and see if that
fixes the problem? 

Thanks, 
-Chris 




From: 

"Vadym Yepishov" <[EMAIL PROTECTED]> 


To: 

<nebula-dev@eclipse.org> 


Date: 

12/26/2007 12:14 PM 


Subject: 

[nebula-dev] Pressing Arrow Down Key right after focusing and
selection of some cell in Grid programmatically leads to
NullPointerException.

 

  _____  



Hi guys, 
  
When I try to focus and select some cell in a grid and right after this to
press "Arrow Down" key, I have got NullPointerException. 
  
I have used the first snippet of grid (and changed it a little bit J) to
reproduce the problem. Here is the snippet: 
  
package com.maconomy.widgets.snippets; 
  
import org.eclipse.nebula.widgets.grid.Grid; 
import org.eclipse.nebula.widgets.grid.GridColumn; 
import org.eclipse.nebula.widgets.grid.GridItem; 
import org.eclipse.swt.SWT; 
import org.eclipse.swt.events.SelectionAdapter; 
import org.eclipse.swt.events.SelectionEvent; 
import org.eclipse.swt.graphics.Point; 
import org.eclipse.swt.layout.GridLayout; 
import org.eclipse.swt.widgets.Button; 
import org.eclipse.swt.widgets.Display; 
import org.eclipse.swt.widgets.Shell; 
  
/** 
 * Creates a simple grid and a button for focusing and selection of the
first cell 
 * of the grid. 
 */ 
public class MxSnippet001GridCellFocusingAndSelection { 
  
  /** 
   * Main entry. 
   * @param args command line arguments 
   */ 
  public static void main(final String [] args) { 
      final Display display = new Display (); 
      final Shell shell = new Shell (display); 
//      shell.setLayout(new FillLayout()); 
      // The following code line was inserted instead of the line commented
out above in 
      // order to be able to add a button below the grid. 
      shell.setLayout(new GridLayout(1, false)); 
  
      final Grid grid = new Grid(shell, SWT.BORDER | SWT.V_SCROLL |
SWT.H_SCROLL); 
      grid.setHeaderVisible(true); 
      final GridColumn column = new GridColumn(grid, SWT.NONE); 
      column.setTree(true); 
      column.setText("Column 1"); 
      column.setWidth(100); 
      final GridItem item1 = new GridItem(grid, SWT.NONE); 
      item1.setText("Root Item"); 
//      final GridItem item2 = new GridItem(item1, SWT.NONE); 
      // The following line was inserted instead of the line commented out
above. 
      final GridItem item2 = new GridItem(grid, SWT.NONE); 
      item2.setText("Second item"); 
//      final GridItem item3 = new GridItem(item2, SWT.NONE); 
      // The following line was inserted instead of the line commented out
above. 
      final GridItem item3 = new GridItem(grid, SWT.NONE); 
      item3.setText("Third Item"); 
      
      // The following code is added to demonstrate the defect with the grid
cell 
      // focusing and selection. 
      grid.setCellSelectionEnabled(true); 
      // The following button is used to focus and select the first cell of
the grid. 
      // Try to press "Arrow Down" key right after clicking on this button. 
      final Button button = new Button(shell, SWT.BORDER); 
      button.addSelectionListener(new SelectionAdapter() { 
        /** [EMAIL PROTECTED] */ 
        @Override 
        public void widgetSelected(final SelectionEvent e) { 
          grid.forceFocus(); 
          // We tried to use the following three code lines in order to both
focus and 
          // select some cell of the grid, but as it was found, the third
code line leads 
          // to the NullPointerException. If we do not use the third line,
the cell is in 
          // fact selected, but NOT FOCUSED (and focusing is what we need). 
          grid.setCellSelection(new Point(0, 0)); 
          grid.setFocusItem(grid.getItem(0)); 
          // When you comment out the following code line the first cell
will be selected 
          // but NOT FOCUSED. You will see that the first cell of the grid
being not 
          // focused is indicated by the fact that the border of the cell is
not present. 
          // If you do not comment the line the first cell will be both
focused and selected, 
          // but pressing "Arrow Down" key leads to NullPointerException. 
          grid.setFocusColumn(grid.getColumn(0)); 
        } 
      }); 
      button.setText("Click this button to select and focus the first cell
of the grid. " + 
                               "Right after clicking this button press
\"Arrow Down\" key."); 
      
      //shell.setSize(200,200); 
      // The following line was inserted instead of the line commented out
above. 
      shell.pack(); 
      shell.open (); 
      while (!shell.isDisposed()) { 
          if (!display.readAndDispatch ()) display.sleep (); 
      } 
      display.dispose (); 
  } 
} 
  
Do you know why it might be a problem? 
  
Best regards, 
  
Vadym Yepishov 
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